Preventive Diplomacy (PD) has been recognized as a useful tool to address security issues in the Asia-Pacific region. A step by step exploration of a PD mode on the basis of consensus compatible with the regional situation has become the common will of countries in the region. Since the region is facing various new challenges, innovation in theories and practices of PD is required. This book intends to promote discussions on the new ideas and new approaches of PD in the region, which can be effectively used to address the needs of the region and promote peace and security.